We have studied the modulation bandwidth of high-speed GaInNAs double-quantum-well lasers emitting at 1.28–1.30μm. A 400μm long ridge waveguide laser exhibits a small signal modulation bandwidth of 14 GHz. The intrinsic damping limited modulation bandwidth is as high as 25 GHz (K=0.35ns), and the actual modulation bandwidth is limited by thermal effects under continuous operation. The saturation of the resonance frequency at 10 GHz was found to be the result of a thermal reduction of the differential gain and a rapid increase of the threshold current when the temperature exceeds 80 °C.
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Wei et al. (2006) studied this question.
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